INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

3.5% Ni

3.5% Ni

(OP)
hi..

Mounded Bullet
DP = 17.5 barg
DT = -46 / 80 deg C

Based on the above design conditions I have selected MOC for Shell/Dish plate SA 350 LF3 and same is procured by vendor. Now client is not accepting this material because of Ni content of 3.5% as it is specified in the client specification that 3.5% Ni shall not be used and asking me to go with SA 350 LF2 cl.1.

Since the material has already been procured, client is asking me to give proper justification to take deviation to specification for using SA 350 LF3 instead of SA 350 F2 Cl.1 material.

Please let me know if any other information is required

kindly help me to solve this issue.

Thanks

RE: 3.5% Ni

You may have had some responses to this by now if this was posted under materials engineering. I'd be interested in the feedback you get also. Maybe delete this and repost in materials engineering.

RE: 3.5% Ni

We have also a processfluid that reacts with the nickel.
We absolutely don't want Ni in the fluid.

RE: 3.5% Ni

DP = 17.5 barg
DT = -46 / 80 deg C
Hi Arvind,

For the above design condition 3.5% Nickel Steel is grossly over designed. 350 LF2,cL-1 materials with guaranteed impact @-46 Deg C would meet your design requirements. If the process fluid is LPG or other compressed gases you should not have concerns with respect to impact with SA 350 LF2 cl.1 steel down upto -46 deg C.

If you choose 3.55 Nickel steel for D.E then all welding on this material has to be done with matching 3.5% steel welding consumable, which involves extra money. If the design conditions are such that it could go well below -46 Deg C, say -60 Deg C or still below then I've seen designers opting for 2.5% Nickel steel.But choosing 3.5%nickel steel is grossly overspending.

You certainly don't want your client to pay the bronze and you deliver him something made of gold.

Thanks.

Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist
Ontario,Canada.
ca.linkedin.com/pub/pradip-goswami/5/985/299
All provided answer are personal opinions or personal judgements only. It's not connected with any employers by any means.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close